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RAK14004 WisBlock Keypad Module Datasheet

Overview​

Description​

RAK14004 WisBlock Keypad Module was designed to be part of a production-ready IoT solution in a modular way and must be combined with a WisBlock Core and a WisBlock Base module.

The RAK14004 module is designed as an IO extension module that allows to add a keypad and create a customized IoT solution. This module can be used in conjunction with RAK14009, RAK14010, or RAK14011 keypad modules.

Features​

  • Module Specifications

    • Up to 8 x 8 buttons using scan matrix arrangement
    • 3.3 V Power supply
    • Chipset: Microchip ATMEGA328PB-AU

  • Size

    • 35 mm x 25 mm

Specifications​

Overview​

Figure 1 and Figure 2 show the RAK14004 top and bottom view of the RAK14004 module.

Figure 3432: RAK14004 top view
Figure 3433: RAK14004 bottom view

Mounting​

The RAK14004 module can be mounted on the IO slot of the WisBlock Base board. Figure 3 shows the mounting mechanism of the RAK14004 on a WisBlock Base module, such as a RAK5005-O.

Figure 3434: RAK14004 mounting mechanism on a WisBlock Base module

Hardware​

The hardware specification is categorized into five parts. It shows the chipset of the module and discusses the pinouts and their corresponding functions and diagrams. It also covers the electrical and mechanical parameters that include the tabular data of the functionalities and standard values of the RAK14004 WisBlock Keypad Module.

Chipset​

VendorPart number
MicrochipATMEGA328PB-AU

Pin Definition​

The RAK14004 comprises a standard WisBlock IO 40-pin connector. The WisBlock IO connector allows the RAK14004 module to be mounted on a WisBlock Base Board, such as RAK5005-O. The pin order of the connector and the pinout definition is shown in Figure 4.

NOTE

I2C related pins, UART related pins, INT, RESET, 3V3, and GND are connected to 40-pin WisBlock IO connector.

Figure 3435: RAK14004 Pin Definition

Electrical Characteristics​

Power Supply Ratings​
SymbolDescriptionMin.Nom.Max.Unit
VDDPower supply1.83.35.5V

Mechanical Characteristics​

Board Dimensions​

Figure 5 shows the dimensions and the mechanic drawing of the RAK14004 module.

Figure 3436: RAK14004 Mechanical Dimensions
WisConnector PCB Layout​
Figure 3437: WisConnector PCB footprint and recommendations

Schematic Diagram​

The RAK14004 uses a Microchip ATMEGA328PB-AU microcontroller for matrix keyboard scanning and identification. A cable is used to connect RAK14004 to keypad modules such as RAK14009.

MCU Schematic​
Figure 3438: MCU schematic
I2C Pull Up Resistor​

The I2C Pull Up Resistor already exists on WisBlock Base Board. R7 and R8 are not mounted on the RAK14004 module.

Figure 3439: I2C Pull Up Resistor
MCU Debug​

J3 is the MCU debug connector.

Figure 3440: MCU Debug connector
warning

Do not connect to this header or you lose the warranty and your RAK14004 will not work anymore.

Matrix Buttons Module Connector​

J2 Matrix Buttons connector is used to connect RAK14004 to keypad modules such as RAK14009, RAK14010, and RAK14011.

Figure 3441: Matrix Buttons Connector
Full schematic​
Figure 3442: RAK14004 Schematic Diagram Part 1
Figure 3443: RAK14004 Schematic Diagram Part 2